UMR CNRS 5805 EPOC
Environnements et Paléoenvironnements
Océaniques et Continentaux

        

Consignes de Sécurité et Numéros d'Urgence
(à l'usage des personnels du laboratoire)

le 15-06-2012 à 10:45

Lieu Salle Stendhal, DGO, Bâtiment B18 Intervenant(s) Kenji MATSUZAKI, Institute of Geology and Paleontology, Graduate School of Science, Tohoku University, Sendai City, 980-8578 JAPAN

Polycystine radiolarians possessing siliceous skeleton widely live in seawaters from the surface to the deep depths. They are commonly preserved as fossils with a variable amount of volumes in pelagic sediments (Kruglikova, 1993; Boltovskoy et al. 2010). Different composition of polycystine radiolarian species is observed in different oceanographic conditions based on the study of modern and recent radiolarians (Lombari & Boden, 1985; Kamikuri et al., 2008; Boltovskoy et al. 2010), and thus the fossil record of polycystine radiolarians is one of efficient micropaleontological tools for paleoceanographical and stratigraphical reconstitution. In this context our presentation will illustrate an application of polycystine radiolarians as a paleoceanographical tools and stratigraphical tools in the Northwestern Japanese region through the core C9001C drilled by the Chikyu cruise in a JAMSTEC expedition. This presentation will be divided into two parts. The first part will be focussed on an extant Nasselarian species Cycladophora davsiana and C.davisiana stratigraphical event. The second part will document the radiolarians assemblage evolution throughout time and their related paleoceanographical event.